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WorksheetsMatrices #1 Practice Honors
Total questions: 27
Worksheet time: 2hrs 51mins
Name
Class
Date
1.
In Matrix R (pictured) what entry is in the second row, third column?
a)
8
b)
9.01
c)
6
d)
1
2.
What is the entry at r31?
a)
3
b)
1
c)
4
d)
7
3.
What is the address of 8?
a)
R23
b)
R32
c)
r23
d)
r32
4.
What must be true in order to ADD two matrices?
a)
They must be square.
b)
The dimensions must be the same.
c)
The determinant can't equal 0.
d)
The column of the 1st must equal the row of the 2nd.
5.
Add
a)
11 8
-4 2
-4 2
b)
3 2
-6 -6
-6 -6
c)
-3 2
-4 -6
-4 -6
d)
10 8
-6 2
-6 2
6.
Subtract
a)
3 -8
0 -1
0 -1
b)
3 -4
8 -13
8 -13
c)
-3 8
0 1
0 1
d)
3 -8
-8 1
-8 1
7.
Find A+B
a)
8 10
8 1
8 1
b)
12 25
7 1
7 1
c)
10 30
0 1
0 1
d)
can't add two together because the rows dont match columns
8.
What are the dimensions of this matrix?
a)
2 x 3
b)
3 x 2
c)
6 x 1
d)
1 x 6
9.
Multiply by the scalar
a)
20 15 -10
30 -5 0
b)
-20 15 -10
30 -5 0
c)
1 8 3
11 4 5
d)
20 -15 10
-30 5 0
10.
Name the dimensions (hint: think of rows then columns)
a)
6x2
b)
2x6
c)
3x2
d)
2x3
11.
Is this possible?
a)
Yes
b)
No
12.
Is this possible?
a)
Yes
b)
No
13.
Subtract
a)
6 -3
-3 0
b)
2 3
3 0
c)
6 -3
3 1
d)
2 7
5 6
14.
Add
a)
11 8
-4 2
-4 2
b)
3 2
-6 -6
-6 -6
c)
-3 2
-4 -6
-4 -6
d)
10 8
-6 2
-6 2
15.
What do w, x, y and z equal in this matrix subtraction?
a)
w = 13, x = 4, y = 7, z = 23
b)
w = 13, x = -4, y = 11, z = 23
c)
w = 13, x = 4, y = 11, z = 23
d)
w = 13, x = 4, y = 11, z = 17
16.
What do m, n, p and q equal in this scalar matrix multiplication?
a)
m=8, n=9, p=-4, q=4
b)
m=15, n = -45, p=20, q=-5
c)
m=20, n=-5, p=15, q=-45
d)
m=-5, n=20, p=-45, q=15
17.
What are the dimensions of this matrix?
a)
2 x 3
b)
3 x 2
c)
6 x 1
d)
1 x 6
18.
Perform the indicated operation. If it’s not possible, select Not Possible.
a)
7
-7
-6
20
-7
-6
20
b)
7
-9
-6
20
-9
-6
20
c)
Not Possible
d)
7
-9
2
20
-9
2
20
19.
find: B*A
a)
47 30
9 5
9 5
b)
17 15
42 35
42 35
c)
10 25
7 1
7 1
d)
not possible because rows do not match columns
20.
Multiply
a)
20 15 -10
30 -5 0
30 -5 0
b)
-20 15 -10
30 -5 0
30 -5 0
c)
1 8 3
11 4 5
11 4 5
d)
20 -15 10
-30 5 0
-30 5 0
21.
What comes first in the order?
a)
Row
b)
Column
22.
You can multiply a 2X3 matrix by which matrix?
a)
2X2
b)
2X12
c)
3X12
d)
2X3
23.
Find the product of the two matrices.
a)
undefined
b)
-3 16
17 12
8 -10
17 12
8 -10
c)
3 12
-15 -8
-1 -3
-15 -8
-1 -3
24.
What is the entry at f42?
a)
23
b)
-81
c)
-44
d)
99
e)
-56
25.
How many columns are in a 5 x 4 matrix?
a)
5
b)
4
c)
20
d)
9
26.
These matrices are being multiplied. Determine the dimension/size of the new matrix.
a)
Can't multiply them
b)
4 x 2
c)
3 x 3
d)
4 x 3
27.
Given matrices A & B:
A is a (4x33) matrix
B is a (33x1) matrix
What are the dimensions of the product of A times B?
A is a (4x33) matrix
B is a (33x1) matrix
What are the dimensions of the product of A times B?
a)
4x1
b)
4x33
c)
33x1
d)
Matrix does not exist
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